The semijoin algebra and the guarded fragment - Dirk Leinders; Jerzy Tyszkiewicz; Jan Van den Bussche (CoRR, 2004)

On the expressive power of semijoin queries. - Dirk Leinders; Jerzy Tyszkiewicz; Jan Van den Bussche (Inf. Process. Lett., 2004)

The Semijoin Algebra and the Guarded Fragment. - Dirk Leinders; Maarten Marx; Jerzy Tyszkiewicz; Jan Van den Bussche (J. Log. Lang. Inf., 2005)

A Theory of Stream Queries. - Yuri Gurevich; Dirk Leinders; Jan Van den Bussche (DBPL, 2007)

On the complexity of division and set joins in the relational algebra. - Dirk Leinders; Jan Van den Bussche (J. Comput. Syst. Sci., 2007)

The semijoin algebra - Dirk Leinders (2008)

Repetitions and permutations of columns in the semijoin algebra. - Dirk Leinders; Jan Van den Bussche (RAIRO Theor. Informatics Appl., 2009)

Database Query Processing Using Finite Cursor Machines. - Martin Grohe; Yuri Gurevich; Dirk Leinders; Nicole Schweikardt; Jerzy Tyszkiewicz; Jan Van den Bussche (Theory Comput. Syst., 2009)

Relative expressive power of navigational querying on graphs. - George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren; Yuqing Wu (ICDT, 2011)

The Impact of Transitive Closure on the Boolean Expressiveness of Navigational Query Languages on Graphs. - George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren; Yuqing Wu (FoIKS, 2012)

Metadata Quality Evaluation of a Repository Based on a Sample Technique. - Marc Goovaerts; Dirk Leinders (MTSR, 2012)

The impact of transitive closure on the expressiveness of navigational query languages on unlabeled graphs. - George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren; Yuqing Wu (Ann. Math. Artif. Intell., 2015)

Relative expressive power of navigational querying on graphs using transitive closure. - Dimitri Surinx; George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren; Yuqing Wu (Log. J. IGPL, 2015)

Relative expressive power of navigational querying on graphs. - George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Dimitri Surinx; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren; Yuqing Wu (Inf. Sci., 2015)

Similarity and bisimilarity notions appropriate for characterizing indistinguishability in fragments of the calculus of relations. - George H. L. Fletcher; Marc Gyssens; Dirk Leinders; Jan Van den Bussche; Dirk Van Gucht; Stijn Vansummeren (J. Log. Comput., 2015)